package com.example.dyy.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

@WebFilter("/movie/*")
public class LoginFilter implements Filter {
    
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        // 初始化方法，可以为空
    }
    
    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        HttpServletRequest req = (HttpServletRequest) request;
        HttpServletResponse resp = (HttpServletResponse) response;
        HttpSession session = req.getSession();
        
        // 检查是否已登录
        if (session.getAttribute("user") == null) {
            resp.sendRedirect(req.getContextPath() + "/index.jsp");
        } else {
            chain.doFilter(request, response);
        }
    }
    
    @Override
    public void destroy() {
        // 销毁方法，可以为空
    }
} 